Date: Sat, 25 Nov 2000 12:39:32 +0000
From: Paul Warren <pdw@ex-parrot.com>
To: linux-kernel@vger.kernel.org
Subject: Problem with NM256 and APM
Message-ID: <20001125123932.H1467@cerberus.grovehouse.local>
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I have a problem with APM interfering with sound playback through a
NeoMagic 256.  

If I have sound playing, and do a "cat /proc/apm" I get a noticeable
glitch in sound playback.  The glitch sounds like playback skips
backwards by a fraction of a second.

The machine is a Dell Latitude CS, and I have seen this problem on
2.2.17 and 2.4.0test11.

The anonymous author of the NM256 driver claims to have not seen this
problem before.

dmesg says:

apm: BIOS version 1.2 Flags 0x03 (Driver version 1.13)
...
NeoMagic 256AV/256ZX audio driver, version 1.1
NM256: Found card signature in video RAM: 0x3fec00
NM256: Mapping port 1 from 0x3e6c00 - 0x3fec00
Initialized NeoMagic 256ZX audio in PCI native mode
Initialized AC97 mixer
Done installing NM256 audio driver.

Any clues as to what might be behind this?

cheers,

Paul
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